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(a+b)(t)(1/2)
a = 10
b = 10-2-2 = 6
(10+6)(7)(1/2)
(16)(7)(1/2) = 8 x 7 = 56 satuan luas
jawab: jumlah sisi sejajar = 10+(10-2-2)= 16
tinggi= 7
16 x 7 = 112. 112÷2= 56 cm persegi